-LRB- CNN -RRB- -- A man celebrating his friend 's impending marriage fell to his death from a Black Hawk , Colorado , hotel window early Saturday , police said .

Dirk Anderson , 29 , was sitting on the ledge of an open window in the 11th-floor room at the Lady Luck Hotel and Casino when the screen on which he was leaning gave way , according to reports by CNN television affiliates KUSA and KCNC .

The Thornton , Colorado , man landed on the roof of a parking garage five levels below , police said .

While there was alcohol at the bachelor party , investigators said they do n't know if Anderson had been drinking before his fall .

There was no evidence of horseplay and it appeared to be an accident , police said .

Black Hawk , a 19th-century gold-mining town , is home to several casinos that attract tourists and gamblers from Denver , 35 miles away .

Woman on first date plunges to her death off 17th-floor balcony

CNN 's John Branch contributed to this report .

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Dirk Anderson , 29 , landed on the roof of a parking garage five levels below

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Investigators do n't know if Anderson had been drinking before his fall

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No evidence of horseplay and it appears to be an accident , police say